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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47baf91675ee7dfb733fab5708f4f192580694ea74e6b65c5458470f7dd07b03' 
  AND token = '0PPQ9vzIUx8IeJZwSkuMnHgvg/XYJ7qgo/fHQo0o90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}